Core slotting device

ABSTRACT

A device for slotting or milling an end of a hollow core to provide keyway means on the core extremity. Structure is included for presenting a hollow core endwise to a rotary cutter of a dimension and position such that the center line or axis of the cutter may lie within the hollow of the core with the core axis extending transverse to the axis of the cutter. The cutter may be of a diameter to slot out two keyways simultaneously and without penetrating the core periphery.

United States Patent 1 Laumer 51 Jan. 9, 1973 [54] CORE SLOTTING DEVICE [75] Inventor: Edward P. Laumer, Neenah, Wis.

[73] Assignee: Kimberly-Clark Corporation,

Neenah, Wis.

[22] Filed: Dec. 21, 1970 [21] Appl. No.: 100,203

[52] U.S. Cl. ..90/ll C, 90/18, 90/DlG. 8, 90/12.2 [51] Int. Cl ..B23c 3/30 [58] Field ofSearch.90/18,11 R, 11 C, 12.2, DIG. 8; 144/136 R [56] References Cited UNITED STATES PATENTS 2,493,021 1/1950 Owens ..90/l1 R 1,245,238 11/1917 Jones ..90/D1G. 8 1,591,874 7/1926 Moore ..90/DlG. 8

FOREIGN PATENTS OR APPLICATIONS 841,243 9/1952 Germany ..90/D1G. 8

Primary Examiner-Francis S. l-lusar Attorney-Daniel J. Hanlon, Jr., William D. Herrick and Raymond J. Miller [57] ABSTRACT A device for slotting or milling an end of a hollow core to provide keyway means on the core extremity. Structure is included for presenting a hollow core endwise to a rotary cutter of a dimension and position such that the center line or axis of the cutter may lie within the hollow of the core with the core axis extending transverse to the axis of the cutter. The cutter may be of a diameter to slot out two keyways simultaneously and without penetrating the core periphery.

6 Claims, 6 Drawing Figures PAIENIEIJJAN 197 3.709.095

SHEET 2 [1F 4 FIG. 2

PAIENIEDJAI 91m 3 709095 SHEET U [1F 4 FIG.6

CORE SLOTTING DEVICE BACKGROUND OF THE INVENTION l. Field of the Invention This invention relates to a device for providing keyways in the ends of hollow cores. More specifically, the invention is directed to a device for providing a keyway in the inner periphery of a hollow core without penetrating completely through the annulus of material forming the core. Still more specifically, the invention is directed to a device for simultaneously forming keyway slots in diametrically opposed zones ofa hollow core.

2. The Invention With Relation to the Prior Art In the paper industry at the manufacturing paper mill it is common practice to wind paper on a hollow core of fiber or the like. The paper is transported on the core to a place of use and the paper is unwound from the core in the course of such use. The conventional core for the purpose is made of paper glued together and wound in many layers into tube shape. These cores are also usually of relatively small internal diameter, that is, between about 3 inches to 6 inches. It is a primary purpose of the present invention to provide a device for the slotting of the ends of such cores to provide keyways on the internal periphery of the core without penetrating completely through the core.

It is an additional purpose of the present invention to provide a device for cutting keyways in hollow cores and in which device means are provided to stabilize the core position during cutting of the keyways.

Another object of the invention is to provide a device for the cutting of the keyways which is so well adapted against undue cutter wear that thousands of slots may be formed without cutter change.

A further object of the invention is to provide a novel method of cutting keyways.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be more fully understood by reference to the following description and the accompanying drawings wherein:

FIG. 1 is a perspective view with parts broken away illustrating the general arrangement of the components of the device;

FIG. 2 is a much enlarged and fragmentary view of a portion of the structure of FIG. 1;

FIG. 3 is a view ofa portion of the device with a core in position. after completion of the cutting operation but with the cutting mechanism not shown;

FIG. 4 is an enlarged view partially in section illustrating particularly the arrangement of the cutting device and with a core shown in dash outline;

FIG. 5 is a fragmentary view with parts broken away illustrating a further embodiment of the invention; and

FIG. 6 is a view of a hollow fiber core having keyways formed therein.

In broad aspect the preferred embodiment of the invention illustrated in FIGS. 1 to 4 of the drawings includes a rotor cutter 34 for slotting out keyways 32.33 in the internal periphery ofa fiber core 31 of small internal diameter, that is, between about 3 inches to 6 inches. The device is adapted to produce a keyway in the core of a length of about to 1% inches and a width about five-eighths to three-fourths inch. The annulus provided by the fiber core material conventionally has a thickness of about five-eighths inch and it is a function of the present device to provide in such annulus the internal keyway or keyways without penetration of the annulus. The keyway depth is usually about three-eighths inch. The usual core for use in the winding of paper is similarly slotted at opposite ends, and the core itself may be quite long, 80 inches or more.

The rotary cutter 34 is adapted to be positioned within the core with its axis transverse to the axis of the core. The core is suitably stabilized against movement during cutting by alignment means for directing the core endwise to the cutter and also suitably by a guide 49 which projects into the core to be cut or slotted. Adjustable stop means are provided to limit the depth to which the cutter and guide 49 are inserted within the hollow fiber core. The cutter is mounted together with a driven gear for rotation as a unit, the gear being operably connected through suitable power transmission means with an electric motor.

Referring to the drawings more in detail and first to FIG. 1, a pair of opposed angle irons designated by the numeral 1 and with vertical supports, one of which is indicated at 2, form a base for equipment now to be described. A mounting plate 3 adjustably positioned on and bridging the angle irons 1 receives an electric motor 4.

At the opposite extremity of the equipment shown in FIG. 1, a second pair of oppositely disposed longitudinally extending angle irons designated by the numeral 5 (FIG. 3 also) are closed by an end plate 6. A channel 7 (FIG. 3) carried on a plate 8 is mounted for adjustment vertically. A conventional nut and bolt 9 arrangement in slot 10 retains the plate 8 on the plate 6 for this purpose. The channel 7 extends longitudinally with the angles 5 toward the mounting plate 3 and base 4 and itself receives on its upper surface a V-guide ll.

Projecting above the V-guide centrally of the length of the device is a framework 12 having a bridging top 13, opposed depending walls 14, and inwardly opposed projecting feet 15. Each wall 14 receives in a central vertically extending channel 16 a T-shaped slide 17, the flanges 18 (FIG. 1) of which carry a flange bearing 19 (FIG. 3). Locking washer 20 carried by the flange bearing surrounds and contacts shaft 21. Shaft 21 centrally between the opposed slides 17 has a roller 22 which is dished concavely centrally for conforming to the surface ofa core to be slotted or routed out as noted more particularly hereinafter. The roller 22 is maintained centrally in position by combinations of opposed washers 23 and nuts 24 threaded on the shaft 21 as most particularly seen in FIG. 3. Guide rods 25 are carried on opposed sides of the frame 12 and extend through and guide slides 17. The rods 25 are retained in position upwardly on the top 13 by a conventional nut 26 threaded on the rods. Similarly, the rods are retained at the lower extremity by a nut 27 threaded on the rod and abutting against the angle irons 5 (FIG. 3).

The rods 25 each pass vertically throughthe feet 15 and angle irons 5. Upwardly, a spring 28 is confined between each of the slides 17 and a combination of-a washer 29 and a nut 30 threaded on each of the rods 25. Accordingly, as may be readily seen from FIG. 3, the guide rods 25 are fixed in position and the springs 28 cooperate to bias the slides and the core roller 22 toward the V-guide or way 1 1.

The core 31 which is to be routed out at its extremity when in cutting position, as shown in FIGS. 1 and 3, is contacted by the spring biased roller 22 which aids in maintaining the core in position securely on the V- guide 11. The concave curvature of the roller 22, while not necessary, does assist in fixing the core 31 against rotation. The extent of compression of the spring 28 is controllable by the position of nuts 29 on the rods, and such serves to determine the force applied by roller 22 to a particular coreand also to permit mounting of cores of differing external diameters.

The slots 32 and 33 are formed in the core by the cutting. The cutting action is itself performed in the device illustrated in FIGS. 1-4 inclusive by a series of blades, the rotary milling cutter as a whole being designated generally at 34. Each blade may carry a plurality of peripherally spaced cutting edges in known manner. In the specific examples shown in FIG. 4, the blades forming the cutter are 7 in number and designated by the numerals 35, 36, 37, 38, 39, 40 and 41. The multiple blade cutter is essentially a dado head and is preferred as it provides long operating and individual blades are readily replaceable.

The gear body 42 having teeth designated at 43 (FIG. 4) is formed at 44 to receive the plurality of the stacked cutter blades 35-41 inclusive adjacent the teeth, thus forming the dado cutter. The blades are retained in their radial position by a key 45 on the body 42. A nut 46 threaded on the body 42 clamps the individual cutters 35-41 together retaining them in position. A set screw 47 projects through the nut (FIG. 4)

engaging the body 42, retaining the nut 46 in position.

A shouldered screw 48 serving as a fixed stud shaft is threadedly received on a combination guide and support 49 (FIGS. 2 and 4). Support 49 is in the form of a rectilineally extending arm and a set screw 50 passing through the arm retains the stud shaft 48 in position relative to the arm. The extremity of arm 49 is of crescent shape and serves as the guide portion of the arm. Bearing 51 rotatably mounts the gear body 42 on the stud shaft 48 and is itself maintained in central position on the stud shaft by washer spacers 52,53. This eliminates the need for an outboard bearing and is helpful in providing a structure of small dimension which may pass into the core.

Gear 54 carried on power transmission shaft 55 meshes with and drives the gear teeth at 43 of gear body 42 carrying the cutters. Shaft 55 on its outer extremity has a pulley 56 which is operably connected by belt 57 with drive pulley 58. Pulley 58 is fixedly mounted on shaft 59 of the motor 4. Shaft 55 is conveniently supported by pillow blocks as at 60. Each pillow block 60, one of which is shown in FIG. 1, is supported from an angle iron 61 suitably bolted to the angle iron I.

The support 49 in the form of the rectilineally extending arm at a zone remote from the rotary milling cutter is welded (FIG. 2) to a support block 63. A mounting 62 in the form of an angle iron as illustrated in FIG. 2 receives a bolt and nut combination 64, the bolt head being designated at 65. The bolt also passes through a longitudinally extending stop member 66. For positioning ofsupport block 63 and support arm 49 relative to the mounting 62, the vertically extending slot is provided in support block 63. Similarly, for horizontal positioning of the stop member 66 relative to the mounting 62, the stop member is horizontally slotted at 70. The mounting 62 is itself fixed to the angle iron 61 (FIG. 1) by suitable means (not particularly shown).

The structural arrangement described of mounting 62, support 49, stud shaft 48, cutter 34 and gear teeth 43 on body 42 provides that the cutter and gear are overhanging relative to the mounting 62 and may conveniently enter a core to be cut. The positioning of the bearing 51 centrally of shaft 55 remote from the support arm aids rigidity of structure while also providing for compactness.

To provide keyways in a core 31, the power transmission components, including electric motor 4 and gear 54, are fixed in position. The mounting 62 is fixed in position also and support 49 with the cutter, stud shaft and gear body thereon, is adjusted vertically to provide the cutter adjacent the extremity of V-guide 11 to accommodate the core size to be cut. The stop member 66 is adjusted horizontally to abut against the core at the completion of the keyway cutting to limit depth of penetration of the cutter into the core. The cutter itself is selected to have a diameter greater than the internal periphery of the hollow core 31 but less than the outside diameter so that the material of the annulus forming the core is not completely cut through radially. With the cutter and V-guide 11 aligned, the core is fed manually to the cutter so that the cutter in its rotation engages the core extremity and passes in the course of cutting into the core to the extent that its rotational axis is within the core. Such rotational axis is transverse to the longitudinal axis of the core. The core itself is maintained down on the guide 11 by the pressure of roll 22 which is preset for the purpose by adjustment of spring tension.

The arrangement of FIG. 5 is similarstructurally but a single blade cutter, a conventional milling tool, is provided and serves the purpose of providing the dual keyways well.

In either the arrangement of FIGS. l'to 4 or FIG. 5 it is desirable, when cutting the usual fiber core, to employ a system to clear the lines from the work area, that is, a conventional vacuum shop system. Generally, the cutter will remove some fiber in a relatively large section as it moves against the grain of the core. Such is, however, not detrimental to the keyway, and no further mechanical working is necessary. The keyway, it may be noted, in use generally has a metal reinforcement.

As many apparently widely different embodiments of this invention may be made without departing from the spirit and scope thereof, it is to be understood that I do not limit myself to the specific embodiments thereof except as defined in the appended claims.

I claim:

1.The process for the formation of axially extending keyways in a hollow core which includes guiding a hollow core to a rotary milling cutter having a diameter greater than the internal diameter of the core and less than the outer diameter of the core so that the longitudinal axis of the core is transverse to the rotational axis of the rotary cutter, driving the cutter in rotation while feeding the core over the cutter, and continuing the movement of the core over the cutter and the rotation of the cutter until the rotational axis of the cutter lies within the core, and thereafter stopping the rotation of the cutter and separating the cutter from the core by moving the core and cutter relative to one another in a longitudinal direction.

2. in combination, in a device for cutting keyways in the internal periphery of a hollow core, a stud shaft. a rotary milling cutter and a power transmission element on the stud shaft for rotation of the cutter and element together, said power transmission element having a lesser diameter than the rotary milling cutter, a support disposed laterally of the rotary milling cutter and the said power transmission element supporting the stud shaft, the rotary milling cutter and the power transmission element, said support projecting away from the stud shaft generally rectilineally, a mounting retaining the support at a zone remote from the stud shaft so that the stud shaft, rotary milling cutter and said power transmission element relative to the mounting are provided as an overhanging structure, and longitudinally extending guide means for a core to be cut projecting longitudinally away from and in alignment with the said rotary milling cutter, the axis of said milling cutter being transverse to the length of said guide means.

3. The combination as claimed in claim 2 in which holding means for a core to be cut project downwardly toward the said guide means, the holding means being disposed away from the axis of the milling cutter in the direction in which the said guide means extends.

4. The combination as claimed in claim 3 in which the guide means are a V-shaped guide and the holding means includes a roller having a concavely contoured surface to accommodate a core of circular cross-section.

5. The combination as claimed in claim 4 in which the said roller is spring biased toward the V-shaped guide.

6. The combination as claimed in claim 2 in which the said power transmission element is a first gear, and other power transmission means, including a gear, are cooperably engaged with the said first gear for driving said rotary cutter. 

1. The process for the formation of axially extending keyways in a hollow core which includes guiding a hollow core to a rotary milling cutter having a diameter greater than the internal diameter of the core and less than the outer diameter of the core so that the longitudinal axis of the core is transverse to the rotational axis of the rotary cutter, driving the cutter in rotation while feeding the core over the cutter, and continuing the movement of the core over the cutter and the rotation of the cutter until the rotational axis of the cutter lies within the core, and thereafter stopping the rotation of the cutter and separating the cutter from the core by moving the core and cutter relative to one another in a longitudinal direction.
 2. In combination, in a device for cutting keyways in the internal periphery of a hollow core, a stud shaft, a rotary milling cutter and a power transmission element on the stud shaft for rotation of the cutter and element together, said power transmission element having a lesser diameter than the rotary milling cutter, a support disposed laterally of the rotary milling cutter and the said power transmission element supporting the stud shaft, the rotary milling cutter and the power transmission element, said support projecting away from the stud shaft generally rectilineally, a mounting retaining the support at a zone remote from the stud shaft so that the stud shaft, rotary milling cutter and said power transmission element relative to the mounting are provided as an overhanging structure, and longitudinally extending guide means for a core to be cut projecting longitudinally away from and in alignment with the said rotary milling cutter, the axis of said milling cutter being transverse to the length of said guide means.
 3. The combination as claimed in claim 2 in which holding means for a core to be cut project downwardly toward the said guide means, the holding means being disposed away from the axis of the milling cutter in the direction in which the said guide means Extends.
 4. The combination as claimed in claim 3 in which the guide means are a V-shaped guide and the holding means includes a roller having a concavely contoured surface to accommodate a core of circular cross-section.
 5. The combination as claimed in claim 4 in which the said roller is spring biased toward the V-shaped guide.
 6. The combination as claimed in claim 2 in which the said power transmission element is a first gear, and other power transmission means, including a gear, are cooperably engaged with the said first gear for driving said rotary cutter. 